Assign structure to English for displaced Zoroastrian (6)
I believe the answer is:
parsee
'displaced zoroastrian' is the definition.
(Zoroastrian whose ancestors fled India)
'assign structure to english' is the wordplay.
'assign structure to' becomes 'parse' (as in parsing a sentence's structure).
'english' becomes 'e' (abbreviation).
'parse'+'e'='PARSEE'
'for' is the link.
(Other definitions for parsee that I've seen before include "Old immigrant" , "A spree, strangely, following Prophet Zoroaster" , "Follower of a pre-Islamic religion - sea rep (anag)" , "See rap turned into a Zoroastrian Indian" , "Religious believer" .)